【题文】已知全集U=R,集合A=,B=,则A∪B=( )A.B.C.D.
题型:难度:来源:
【题文】已知全集U=R,集合A=
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121731-53743.png)
,B=
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121732-53469.png)
,则A∪B=( )
答案
【答案】A
解析
【解析】
试题分析:由
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121733-25356.png)
得:
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121734-33931.png)
.由
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121734-78263.png)
得:
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121734-26787.png)
.所以A∪B=
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121732-80850.png)
.
考点:1、指数函数与对数函数;2、集合的基本运算.
举一反三
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121448-77784.png)
是定义在
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121448-93206.png)
上的函数,且对任意实数
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121449-82824.png)
,恒有
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121449-56005.png)
,且
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121448-77784.png)
的最大值为1,则满足
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121449-48576.png)
的解集为
【题文】已知全集U=R,集合A=
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121300-73524.png)
,B=
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331121300-36067.png)
,则A∪B=( )
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331120317-47115.png)
是定义在
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331120317-18816.png)
上的函数,且对任意实数
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331120318-78181.png)
,恒有
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331120318-27367.png)
,且
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331120317-47115.png)
的最大值为1,则满足
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331120318-34584.png)
的解集为
最新试题
热门考点